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Table 1. Summary of Groundwater Mon9ing Data: Water Elevations and Analyses <br /> ARCO Facility 2133, Stockton, California <br /> Top-of-casing Depth-to- Product Water-level Change since Concentrations in pg/L mg/L <br /> Well number elevation, feet water, thickness, elevation, last measurement, Total <br /> and date above mean sea level in feet m feet in feet(a) 1n feet Benzene Toluene Ethylbenzene Xylenes TPH-G MTBE DO <br /> 615197 NP 1035 -- -7 81 -170 <0 5 <0 5 <0 5 <0 5 <50 <5 1 56 <br /> 8/19/97 NP 11 76 -- -922 -141 <0 5 <0 5 <0 5 <0 5 <50 <5 037 <br /> 11/25/97 NP 11 91 -- -937 -015 <0 5 <0 5 <0 5 <0 5 <50 <5 0 61 <br /> MW-5 104 <br /> 3/8195 1291 -- -11 87 -- 43 4 7 3 3 60 1800 -- -- <br /> 6/2/95 It 40 -- -1036 1 51 55 2 7 2 3 75 1300 -- -- <br /> 9/11/95 1365 -- -1261 -225 87 3 9 1 29 1500 -- -- <br /> 1215195 1403 -- -1299 -038 120 <10(e) 16 11 2200 -- -- <br /> 3/18/96 10 82 -- -978 321 190 19 24 800 8200 --6/18/96 950 -- -846 132 170 <25 <25 2500 15,000 <250 -- <br /> 9/25196 1230 -- -1126 -2 80 130 <5 8 4 71 3,800 <50 -- <br /> 12/4/96 1163 -- -1059 067 88 <2 15 44 4,200 <20 -- <br /> 3/19/97 P 7 18 -- -6 14 445 26 5 6 4 6 9 8 1,400 -- 0 11 <br /> 6/5/97 P 884 -- -7 80 -1 66 22 5 1 4 14 1,900 <10 0 17 <br /> 8119/97 NP 1025 -- -921 -141 <0 5 <0 5 <0 5 <0 5 <50 <5 0 18 <br /> 11/25/97 NP 1048 -- -944 -023 <0 5 <0 5 <0 5 096 210 <5 0 15 <br /> (a)Corrected water-level elevation value where free product is present(Wlc=Wim +(b)(p)), where <br /> Wlc=water-level elevation corrected, Wlm=water-level elevation measured,b=hydrocarbon thickness(in <br /> feet),p=specific gravity(0 7)of hydrocarbon <br /> Notes Dash indicates not measured or not calculated <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline by USEPA Method 8015, Modified <br /> BTEX Distinction by USEPA Method 8020 <br /> MTBE=Methyl Tert-Butyl Ether by USEPA Method 8020 <br /> DO=Dissolved Oxygen <br /> P=Well purged prior to sample collection <br /> NP= Well not purged prior to sample collection <br /> Wells E-3, E-4, E-5, E-6, E-7, PR-2, BHD-2 MW-I, MW-2,and MW-3 on a semi-annual sampling schedule <br /> Sampled during the first and third quarters of each year <br /> e <br /> l 47s71rAnLCS12133NOV7 X1 S <br /> i <br /> I <br />